Bonsoir
E= (7+4x)+(2x-4)
E = 7 + 4x + 2x - 4
E = 4x + 2x + 7 - 4
E = 6x + 3
F= (3-5y)-( -3-4y)
F = 3 - 5y + 3 + 4y
F = - 5y + 4y + 3 + 3
F = - y + 6.
G= (4x-3) -(5-7x)+(-8x+5)
G = 4x - 3 - 5 + 7x - 8x + 5
G = 4x + 7x - 8x - 3 - 5 + 5
G = 3x - 3
H= - (8x²-7x)+(3+4x²)-(9x-11)
H = 8x² - 7x + 3 + 4x² - 9x + 11
H = 8x² + 4x² - 7x - 9x + 3 + 11
H = 12x² - 16x + 14
